Vim li cas cov hnab yas degradable xaiv PLA thiab PBAT ua raw khoom?

Nrog rau kev ua kom muaj kuab paug "dawb paug" muaj kuab paug, lub teb chaws thoob ntiaj teb tau qhia txog kev txwv cov yas yas, cov hnab yas degradable nyob hauv cov khw loj thiab cov khw muag khoom, thiab kev soj ntsuam ceev yuav pom tias yuav luag tag nrho cov hnab yas degradable no yog PBAT + PLA + St. Yog li dab tsi yog qhov zoo ntawm PBAT + PLA + St?

01. Starch
Starch nroj tsuag yog dav faib nyob rau hauv txiv hmab txiv ntoo, keeb kwm los yog nplooj ntawm txiv hmab txiv ntoo los yog nroj tsuag. Ntau pua lab tons ntawm cov hmoov txhuv nplej siab tau tsim thoob ntiaj teb txhua xyoo, thiab nws yog ib qho ntawm ntau cov khoom siv txuas ntxiv dua tshiab thiab biodegradable. Txawm li cas los xij, vim cov qauv microcrystalline thiab granular qauv, cov hmoov txhuv nplej siab ntuj tsis muaj cov khoom siv thermoplastic, yog li nws yuav tsum tau hloov mus rau hauv cov hmoov txhuv nplej siab thermoplastic kom muaj cov khoom siv thermoplastic.

02. PAB
Polyadipic acid / butylene terephthalate (PBAT) yog ib chav kawm ntawm degradable polyester uas tau nyiam ntau xim, uas tsis yog tsuas yog muaj cov khoom zoo ntawm PBT polyester, tab sis kuj muaj qhov zoo stretch thiab ductility ntawm aliphatic polyester, thiab tseem tuaj yeem degraded rau hauv dej thiab carbon dioxide nyob rau hauv tej yam ntuj tso.
Txawm li cas los xij, tus nqi siab ntawm cov khoom txwv nws daim ntawv thov hauv kev ua lag luam; Yog li ntawd, nws pheej yig, biodegradable starch sib xyaw nrog PBAT yog qhov kev xaiv zoo.

03. PLAJ
PLA (polylactic acid) tseem hu ua polylactic acid, cov txheej txheem ntawm polylactic acid tsis muaj kuab paug, thiab cov khoom tuaj yeem biodegradable kom ua tiav cov khoom siv rov ua dua tshiab, yog li nws yog cov khoom siv ntsuab zoo tagnrho, thiab yog ib qho ntawm cov neeg sawv cev. ntawm bio-based biodegradable plastics.
Txawm li cas los xij, kuj tseem muaj ntau qhov tsis zoo hauv cov ntawv thov: PLA muaj qhov tsis zoo, tsis muaj elasticity thiab yooj, kev ntxhib los mos thiab brittleness, kuj tsis tshua muaj zog, thiab qeeb crystallization tus nqi, uas txwv nws daim ntawv thov nyob rau hauv ntau yam.
Cov qauv tshuaj ntawm PLA muaj ntau cov ester bonds, uas ua rau tsis zoo hydrophilicity thiab degradation tus nqi yuav tsum tau tswj. Ntxiv mus, tus nqi siab ntawm PLA nce tus nqi ntawm cov khoom siv raw thiab txwv nws cov kev lag luam nce qib. Yog li ntawd, nyob rau hauv kev pom ntawm cov saum toj no ntau shortcomings, PLA yog hloov.
PBAT muaj kev ntxhib los mos, muaj zog ductility thiab luv luv degradation voj voog. PLA muaj kev ntxhib los mos, tsis muaj zog, thiab lub voj voog ntev degradation, yog li kev sib xyaw ob yog ib txoj hauv kev zoo rau kev sib koom ua ke txhim kho kev ua haujlwm.

04. Taw qhia txog PBAT/PLA cov ntaub ntawv

【Compatibility】

Kev sib xyaw ua ke ntawm PBAT thiab PLA yog kev hloov kho lub cev, thiab nws lub ntsiab lus tseem ceeb yog xav tau kev sib raug zoo ntawm ob. Txawm li cas los xij, kev solubility ntawm PBAT thiab PLA yog qhov sib txawv heev, yog li qhov kev sib raug zoo tsis zoo, thiab nws nyuaj rau kev sib tov sib npaug.

Kev txhim kho kev sib raug zoo ntawm PBAT nrog PLA yog qhov tseem ceeb tshaj plaws. Nws yog ib qho tsim nyog los ntxiv ib lossis ntau qhov sib xyaw ua ke thaum lub sij hawm sib xyaw ua ke los txhim kho qhov adhesion ntawm PBAT thiab PLA interfaces. Feem ntau siv compatibilizers yog: plasticizers, reactive compatibilizers, thiab ductile polymers.

【Mechanical Properties】

PLA thiab PBAT muaj kev ua tau zoo ntxiv, yog li yuav tsum muaj qhov sib piv zoo ntawm kev ua tau zoo.

1. Qhov kev faib ua feem ntawm PLA nce mus rau 40% raws li qhov node, lub zog tensile ntawm cov khoom txo qis ua ntej thiab tom qab ntawd nce, thiab qhov elongation ntawm kev tawg ua ntej txo qis, thiab tom qab ntawd tseem nyob ruaj khov.

2. Yog tias cov ntsiab lus PLA muaj ntau dua 70%, qhov brittleness ntawm cov khoom muaj zog heev rau tshuab rau hauv zaj duab xis. Yog li ntawd, qhov piv ntawm PLA rau PBAT yuav tsum tau khaws cia ntawm li 1: 1 raws li qhov ntxiv.

【Degradation Performance】

Thawj cov tshuaj tiv thaiv ntawm cov khoom degradation yog nkag mus ntawm cov dej molecules kom nkag mus rau cov tshuaj tiv thaiv hydrolysis. Yog tias nws yog cov khoom siv PBAT cais, nws yog qhov nyuaj rau cov dej molecules nkag mus rau vim yog cov ester ruaj khov hauv cov qauv molecular, yog li nws tsis yooj yim rau degrade. Txawm li cas los xij, PLA molecules tau yooj yim tawm tsam los ntawm dej thiab degraded sab hauv, yog li qhov siab dua PLA cov ntsiab lus, qhov ceev ntawm cov khoom degradation.